To pick warded locks, you need a suitable blank key. You cover one side of the bit with a thin layer of plasticine, or wax, or soot (from a candle). You try to turn the key and you see where the wards leave marks. You file away the metal until the key turns freely.
The key’s bit lifts a spring that holds the bolt, then throws the bolt.
This in principle, if the mechanisms are not jammed or rusted.
Now I need blank keys. If I had a welding equipment I could make blanks from brass tubing and scraps: but I do not have it, so I will possibly need help from the Physics’ workshop.